Sorry Scott-the rotation is determined from the pulley side. Right hand rotation refers to which hand you had to use to crank start engines, originally. Hence a right hand engine uses your right hand to crank it (since most people are right handed) and spins clockwise when looking at the pulley end. Good Luck, TomC

Don't go looking at the pulley on mine for the direction, because on my backwards engine there there is only one pulley and it's on the oposite side as the flywheel but it's not spinning the direction of the engine. And I never paid attention to the radiator fan but I think it spins the wrong way too. Its not direct drive, though it's a fluid driven torque converter, but at first look it looks like gears from the crank would be turning it. So back to my original post, it's what the transmission needs to accept, the direction the transmission input will turn. Which I suppose is still backwards if you're looking at a flywheel but you need to "be the transmission" while you at looking at it. I didn't know I needed to look at a book to determine if it turns a transmission left or right. However my system only works when an engine is running and or turning over, because if I just saw an engine sitting on the ground, especially like a marine version that's not clearly a gm or mci, I wouldn't know unless it was running. Or what if someone changed the direction of like a GM engine, easy to assume by looks or even if someone put the wrong starter on one, so it cranked the wrong way, so it might run horrible or not at all but it would be turning wrong. So clearly I don't know the real way, but more oil leaks out on my left hand side, so it must be left hand rotation.